RE: [avr-gcc-list] AVRDude serial access problem under WinXP

[Eric Weddington]

> -----Original Message-----
> From: 
> address@hidden 
> [mailto:address@hidden
> org] On Behalf Of Joerg Wunsch
> Sent: Saturday, March 24, 2007 1:29 AM
> To: address@hidden
> Subject: Re: [avr-gcc-list] AVRDude serial access problem under WinXP
> 
> "Vrudny, Noah O" <address@hidden> wrote:
> 
> > And Bob, your right. It would be much better if the ser_open()
> > exception would resolve to something like 'try -c stk500v2' instead
> > of just 'access denied'.
> 
> Sorry, ser_open() just displays what it gets from the underlying
> operating system.  If the operating system tells "access denied", how
> the **** should avrdude know that this was just a joke only?
> 

Looking in ser_win32.c, at the implementation of ser_open(), I see that it
does not print a message of
"ser_open():failed Access Denied"
The "failed Access Denied" part of the message must be printed from the OS.

The ser_open() function (for win32) has 5 possible failure modes, and all of
them call exit(1), instead of returning to the calling function. I find it
odd that somehow using stk500v2 magically solves the problem. ser_open() is
used to open the serial port, which comes before any protocol data exchange.

There must be other things going on here.

Eric